Sadayuki Gotō, nicknamed Gotchan, is a popular and attractive student at Keibu High School. He maintains a cool, composed exterior, yet underlying insecurities influence his interactions and choices. His significant relationship with classmate Aya is tested when, alongside a group, they discover new transfer student Shion Ashimori is artificial and agree to hide her identity; Aya initially resists involvement.

Gotchan's involvement intensifies as Shion's earnest attempts to spread happiness affect the group. He undergoes a subtle yet significant transformation, shifting from passive observation to active engagement in Shion's group activities. This change is partly driven by his evolving dynamic with Aya, whose personal journey contributes to his development.

When authorities detain Shion for deletion, Gotchan commits to the rescue mission, joining Satomi Amano, Tōma Suzaki, Aya, and Thunder. His dedication during this critical operation demonstrates his growth beyond initial reservations and insecurities. The collaborative effort cements his bonds with the others, marking a clear evolution from detachment to committed solidarity.